Allow direct uploads via API

config/initializers/active_storage.rb

@@ -35,6 +35,16 @@ module ActiveStorageControllerExtensions
   end
 end
 
+module ActiveStorageDirectUploadsControllerExtensions
+  extend ActiveSupport::Concern
+
+  included do
+    include Authentication
+    skip_forgery_protection if: :authenticate_by_bearer_token
+  end
+end
+
 Rails.application.config.to_prepare do
   ActiveStorage::BaseController.include ActiveStorageControllerExtensions
+  ActiveStorage::DirectUploadsController.include ActiveStorageDirectUploadsControllerExtensions
 end

test/controllers/active_storage/direct_uploads_controller_test.rb

@@ -0,0 +1,72 @@
+require "test_helper"
+
+class ActiveStorage::DirectUploadsControllerTest < ActionDispatch::IntegrationTest
+  setup do
+    @blob_params = {
+      blob: {
+        filename: "screenshot.png",
+        byte_size: 12345,
+        checksum: "GQ5SqLsM7ylnji0Wgd9wNC==",
+        content_type: "image/png"
+      }
+    }
+  end
+
+  test "create" do
+    sign_in_as :david
+
+    post rails_direct_uploads_path,
+      params: @blob_params,
+      headers: bearer_token_header(identity_access_tokens(:davids_api_token).token),
+      as: :json
+
+    assert_response :success
+    assert_includes response.parsed_body.keys, "direct_upload"
+  end
+
+  test "create with valid access token" do
+    post rails_direct_uploads_path,
+      params: @blob_params,
+      headers: bearer_token_header(identity_access_tokens(:davids_api_token).token),
+      as: :json
+
+    assert_response :success
+    assert_includes response.parsed_body.keys, "direct_upload"
+  end
+
+  test "create with read-only access token" do
+    post rails_direct_uploads_path,
+      params: @blob_params,
+      headers: bearer_token_header(identity_access_tokens(:jasons_api_token).token),
+      as: :json
+
+    assert_response :unauthorized
+  end
+
+  test "create with invalid access token" do
+    post rails_direct_uploads_path,
+      params: @blob_params,
+      headers: bearer_token_header("invalid_token"),
+      as: :json
+
+    assert_response :unauthorized
+  end
+
+  test "create unauthenticated" do
+    post rails_direct_uploads_path,
+      params: @blob_params.merge(authenticity_token: csrf_token),
+      as: :json
+
+    assert_response :redirect
+  end
+
+  private
+    def bearer_token_header(token)
+      { "Authorization" => "Bearer #{token}" }
+    end
+
+    def csrf_token
+      get new_session_url
+      response.body[/name="csrf-token" content="([^"]+)"/, 1]
+    end
+end